Electroluminescent (EL) devices

ABSTRACT

An electroluminescent device containing an anode, an organic electroluminescent element, and a cathode wherein the electroluminescent element contains, for example, a fluorescent hydrocarbon component of Formula (I)  
                 
 
     wherein R 1  and R 2  are substituents, which are selected from the group consisting of hydrogen, an alkyl, an alicyclic alkyl, an alkoxy, a halogen, and a cyano; Ar 1  and Ar 2  are each independently an aromatic component or an aryl group comprised of a from about 4 to about 15 conjugate-bonded or fused benzene rings.

RELATED COPENDING APPLICATIONS AND PATENTS

[0001] Illustrated in copending applications U.S. Serial No. (not yetassigned—D/A0658), filed concurrently herewith, the disclosure of whichis totally incorporated herein by reference, is an organic lightemitting device comprising in an optional sequence

[0002] (i) a substrate;

[0003] (ii) a first electrode;

[0004] (iii) a mixed region comprising a mixture of a hole transportmaterial and an electron transport material, and wherein this mixedregion includes at least one organic luminescent material;

[0005] (iv) a second electrode;

[0006] (v) a thermal protective element coated on the second electrode;wherein, one of the two said first and second electrodes is a holeinjection anode, and one of the two said electrodes is an electroninjection cathode, and wherein the organic light emitting device furthercomprises;

[0007] (vi) a hole transport region, interposed between the anode andthe mixed region, wherein the hole transport region optionally includesa buffer layer; and

[0008] (vii) an electron transport region interposed between the secondelectrode and the mixed region; and in U.S. Serial No. (not yetassigned—D/A0659), filed concurrently herewith, the disclosure of whichis totally incorporated herein by reference, is an organic lightemitting device comprising in sequence

[0009] a substrate;

[0010] a first electrode;

[0011] a light-emitting region comprising an organic luminescentmaterial; and

[0012] a second electrode.

[0013] Illustrated in U.S. Pat. No. 5,942,340; U.S. Pat. No. 5,952,115;U.S. Pat. No. 5,932,363; U.S. Pat. No. 5,925,472, and U.S. Pat. No.5,891,587, the disclosures of which are totally incorporated herein byreference, are EL devices. In U.S. Pat. No. 5,925,472, the disclosuresof which are totally incorporated herein by reference, there aredisclosed organic EL devices with blue luminescent materials comprisedof metal chelates of oxadiazole compounds, and which devices may providea greenish blue color.

[0014] Illustrated in U.S. Pat. No. 6,057,048, the disclosure of whichis totally incorporated herein by reference, is an electroluminescentdevice comprised of an anode, a hole transporting layer, a lightemitting layer, and a cathode, wherein said light emitting layercontains a component of the formula

[0015] wherein Ar¹, Ar², Ar³, and Ar⁴ are each independently aryl oroptionally aliphatic; R¹ and R² are independently selected from thegroup consisting of hydrogen, aliphatic, halogen, and cyano; L is asuitable linking group; and n is a number of from 0 to about 3.

[0016] The appropriate components and processes of the above patents andcopending applications may be selected for the present invention inembodiments thereof.

BACKGROUND OF THE INVENTION

[0017] This invention is directed to organic electroluminescent (EL)devices, and more specifically, to organic EL devices with a number ofexcellent performance characteristics inclusive of the enablement ofblue emitting EL devices, which devices contain luminescent componentsor a luminescent component with excellent high thermal stability, filmforming characteristics and intense blue fluorescence. Organic ELdevices are desired that are capable of providing uniform luminescence,saturated color especially in the blue regions of the visible spectrum,and low driving voltages. The organic EL devices of the presentinvention enable in embodiments the above characteristics and whichdevices contain organic luminescent materials or light emittingcomponents comprised of fluorescent hydrocarbon compounds, and whichdevices can be selected for use in flat-panel emissive displaytechnologies, including TV screens, computer screens, and the like.

PRIOR ART

[0018] A simple organic EL device can be comprised of a layer of anorganic luminescent material conductively sandwiched between an anode,typically comprised of a transparent conductor, such as indium tinoxide, and a cathode, typically a low work function metal such asmagnesium, calcium, aluminum, or the alloys thereof with other metals.The EL device functions on the principle that under an electric field,positive charges (holes) and negative charges (electrons) arerespectively injected from the anode and cathode into the luminescentlayer and undergo recombination to form excitonic states whichsubsequently emit light. A number of prior art organic EL devices havebeen prepared from a laminate of an organic luminescent material andelectrodes of opposite polarity, which devices include a single crystalmaterial, such as single crystal anthracene, as the luminescentsubstance as described, for example, in U.S. Pat. No. 3,530,325.However, these devices usually require excitation voltages on the orderof 100 volts or greater.

[0019] In U.S. Pat. No. 4,539,507 there is disclosed an EL device formedof a conductive glass transparent anode, a hole transporting layer of1,1-bis(4-p-tolylaminophenyl)cyclohexane, an electron transporting layerof 4,4′-bis(5,7-di-tert-pentyl-2-benzoxzolyl)stilben, and an indiumcathode.

[0020] U.S. Pat. No. 4,720,432 discloses an organic EL device comprisinga dual-layer hole injecting and transporting zone, one layer beingcomprised of porphyrinic compounds supporting hole injection and theother layer being comprised of aromatic tertiary amine compoundssupporting hole transport.

[0021] U.S. Pat. No. 4,769,292 discloses an EL device employing aluminescent zone comprised of an organic host material capable ofsustaining hole-electron recombination and a fluorescent dye materialcapable of emitting light in response to energy released byhole-electron recombination. A preferred host material is an aluminumcomplex of 8-hydroxyquinoline, namelytris(8-hydroxyquinolinate)aluminum.

[0022] While recent progress in organic EL research has elevated thepotential of organic EL devices for widespread applications, theperformance levels of a number of current available devices, especiallywith respect to blue emission, may still be below expectations. Further,for visual display applications, organic luminescent materials shouldprovide a satisfactory color in the visible spectrum, normally withemission maxima at about 460, 550 and 630 nanometers for blue, green andred. These organic EL devices may comprise a light-emitting layer whichis comprised of a host material doped with a guest fluorescent materialthat is responsible for color emission. For efficient down-shifting ofEL emission wavelength in the host-guest emitting layer, it may bedesirable that the host material should fluorescence in the blue orshorter wavelength region. In many conventional organic EL devices, theluminescent zone or layer is formed of a green-emitting luminophor oftris(8-hydroxyquinolinate)aluminum with certain fluorescent materials.U.S. Pat. No. 5,409,783 discloses a red-emitting organic EL device bydoping the tris(8-hydroxyquinolinate)aluminum layer with a redfluorescent dye. However, up-shifting of thetris(8-hydroxyquinolinate)aluminum emission to blue region is believedto be highly inefficient. Although there have been several disclosuresdescribing blue-emitting organic EL devices, for example in U.S. Pat.Nos. 5,151,629 and 5,516,577, the disclosures of which are totallyincorporated herein by reference, their performance characteristicsstill possess many disadvantages such as poor emission hue, highoperation voltages, low luminance, and poor operation stability. Thus,there continues to be a need for improved luminescent compositions fororganic EL devices, which may vacuum evaporable and form thin films withexcellent thermal stability. There is also a need for luminescentcompositions which are capable of providing uniform and satisfactoryemission in the blue region of the light spectrum. In particular, thereis a need for efficient blue luminescent materials for organic ELdevices, which may optionally be doped with a fluorescent dye. Further,there is also a need for luminescent compositions which can enhancecharge transporting characteristics, thus lowering device drivingvoltages. Therefore, a primary feature of the present invention is toprovide luminescent materials comprised of certain fluorescenthydrocarbon compounds, which in comparison to certain EL devicescomprised of the metal chelates of oxadiazole compounds can provideimproved and excellent emission characteristics particularly in the blueregion, such as a saturated blue color and a narrow emission spectrum.

SUMMARY OF THE INVENTION

[0023] It is a feature of the present invention to provide luminescentcompositions for organic EL devices.

[0024] It is another feature of the present invention to provide organicEL devices with many advantages, such as low operation voltages, uniformlight emission with spectrum spreading from blue to longer wavelengths,thermal stability, electrochemical stability, and charge transportcapability.

[0025] In an another feature of the present invention there are providedorganic EL devices with a light emitting layer containing a luminescentmaterial comprised of novel fluorescent hydrocarbon compounds.

[0026] In yet another feature of the present invention there areprovided organic EL devices with a light-emitting layer comprised of aluminescent hydrocarbon compound.

[0027] Further, in a feature of the present invention there are providedorganic EL devices comprised of a supporting substrate of, for example,glass, an anode, an optional buffer layer, a vacuum deposited organichole transporting layer comprised of, for example,4,4′-bis-(9-carbazolyl)-1,1-biphenyl, a vacuum deposited light emittinglayer comprised of a luminescent hydrocarbon compound, an optionalvacuum deposited electron transporting layer, and in contact therewith alow work function metal, such as magnesium, lithium, and their alloys asa cathode.

[0028] Yet in another feature of the present invention there is providedan organic EL device comprised of a supporting substrate of, forexample, glass, an anode, an optional buffer layer, a vacuum depositedorganic hole transporting layer comprised of tertiary aromatic amines,for example, N,N′-1-naphthyl-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine, avacuum deposited light emitting layer, an optional vacuum depositedelectron transporting layer, and in contact therewith a low workfunction metal, such as magnesium and its alloys as a cathode, whereinthe light emitting layer is comprised of a mixture of a novelhydrocarbon compound as a host component and an optional fluorescentmaterial.

[0029] These and the other features of the present invention areaccomplished by the provision of luminescent or light emittingcomponents comprised of the hydrocarbon compounds illustrated by theFormula (I)

[0030] wherein R¹ and R² are substituents, which may be selected fromthe group consisting of hydrogen, an alkyl group with, for example, from1 to about 25, and more specifically, to about 6 carbon atoms, an arylgroup with about 6 to about 30 carbon atoms, an alkoxy group with from 1to about 25, and more specifically, to about 6 carbon atoms, a halogen,a cyano group and the like; Ar¹ and Ar² are each an aromatic component,such as an aryl group with, for example, about 4 to about 10conjugate-bonded or fused benzene rings, and which may be independentlyselected, for example, from the group consisting of those as representedby or encompassed by the following formulas

[0031] wherein R₁₁, R₁₂, R₁₃, R₁₄, and R₁₅ are each a substituentselected from the group consisting of hydrogen, an alkyl group with, forexample, from 1 to about 6 carbon atoms, an alicyclic alkyl group withfrom about 3 to about 15 carbon atoms, an alkoxy group with, forexample, preferably from 1 to about 6 carbon atoms, a dialkylamino groupwith preferably from about 1 to about 3 carbon atoms, a halogen, a cyanogroup and the like.

[0032] The features of the present invention can be also accomplished bythe provision of luminescent or light emitting components comprised ofthe hydrocarbon compounds illustrated by Formula (II)

[0033] wherein R¹ and R² are substituents, which may be selected fromthe group consisting of hydrogen, an alkyl group with, for example,preferably from 1 to about 6 carbon atoms, an alicyclic alkyl group withfrom about 3 to about 15 carbon atoms, an aryl group with about 6 toabout 30 carbon atoms, an alkoxy group with preferably from 1 to about 6carbon atoms, a halogen, a cyano group and the like; R³, R⁴, R⁵, and R⁶are each a substituent, which may be selected from the group consistingof hydrogen, an alkyl group with, for example, preferably from 1 toabout 6 carbon atoms, an alicyclic alkyl group with from about 3 toabout 15 carbon atoms, an aryl group with about 6 to about 30 carbonatoms, an alkoxy group with preferably from 1 to about 6 carbon atoms,and the like, wherein R³ and R⁴, or R⁴ and R⁵ may optionally be combinedinto a bivalent hydrocarbon group, and is, for example, selected fromthe group consisting of an alkylene group with from about 3 to about 8carbon atoms, an alkylidene group with from about 3 to about 15 carbonatoms, an alicyclic alkylidene group with from about 3 to about 15carbon atoms, and a arylalkylidene group with from about 6 to about 30carbon atoms, and the like; Ar¹ and Ar² are each an aromatic component,such as an aryl group with from about 6 to about 30 carbon atoms, or anarylvinyl group with from about 6 to about 30 carbon atoms, which may,for example, be selected from the group consisting of a phenyl, abiphenylyl, a 3,5-diarylphenyl, a phenylvinyl, a diphenylvinyl, and thelike; and wherein Ar is a tetravalent aromatic group with, for example,from about 6 to about 60 carbon atoms, and which group may selected, forexample, from the group consisting of the following formulas

[0034] wherein R₁₁, R₁₂, and R₁₃ are each a substituent, which may beselected from the group consisting of hydrogen, an alkyl group with, forexample, preferably from 1 to about 6 carbon atoms, an alicyclic alkylgroup with from about 3 to about 15 carbon atoms, an alkoxy group with,for example, preferably from 1 to about 6 carbon atoms, a dialkylaminogroup with preferably from about 1 to about 3 carbon atoms, a halogen, acyano group and the like.

[0035] In embodiments, the present invention relates to organic ELdevices that are comprised in the following order of a supportingsubstrate of, for example, glass, an anode, an optional buffer layer, anorganic hole transporting layer, an organic light emitting hydrocarbonlayer, and an optional electron transporting layer, and in contacttherewith a low work function metal as a cathode, wherein the lightemitting layer contains at least one luminescent hydrocarbon compoundillustrated and encompassed by the formulas recited herein, for example(I) and (II); and layered EL devices with a light emitting layercomprised of a luminescent composition comprised of a hydrocarboncompound illustrated by, for example, Formulas (I) and (II) as a hostcomponent capable of sustaining hole-electron recombination and a guestfluorescent material capable of emitting light in response to energyreleased by the hole-electron recombination. The light emitting layermay be formed by vacuum deposition from evaporation of the fluorescenthydrocarbon material, and wherein the presence of the fluorescentmaterial permits a wide latitude of wavelengths of light emission andmay enable the enhancement of electroluminescent efficiency andimprovements in device operation stability.

[0036] The luminescent or light emitting hydrocarbon materialsillustrated herein possess in embodiments several advantages. Forexample, the hydrocarbon compounds exhibit strong fluorescence in thesolid state in the region of from about 400 nanometers to longerwavelengths of, for example, about 600 nanometers; they have the abilityof forming thin films with excellent thermal stability by vacuumevaporation; they are stable; and they can also be blended with a numberof fluorescent materials to form a common phase.

FIGURES

[0037] The FIGURE illustrates an EL device or an organic light emittingdiode which is comprised of a supporting substrate 1 of, for example,glass; an anode 2 of, for example, indium tin oxide in a thickness offrom about 1 to about 100 nanometers and preferably from about 10 toabout 80 nanometers (throughout the thickness ranges for each layer areexamples and other suitable thickness may be selected); optionally abuffer layer 3 of, for example, copper (II) phthalocyanine in athickness of from about 5 to about 80 nanometers and preferably fromabout 10 to about 40 nanometers; an organic hole transporting layer 4 ofan aromatic amine compound, for exampleN,N′-1-naphthyl-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine in a thicknessof from about 1 to about 100 nanometers and preferably from about 5 toabout 80 nanometers; an organic light emitting layer 5 comprised of aluminescent hydrocarbon compound of the formulas or encompassed by theformulas illustrated herein in a thickness of from about 1 to about 100nanometers and preferably from about 20 to about 80 nanometers; anorganic electron transporting layer or hole blocking layer 6 of, forexample, 4,4′-bis-[2-(4,6-diphenyl-1,3,5-triazinyl)]-1,1′-biphenyl ortris-(8-hydroxyquinolinato)aluminum in a thickness of from about 1 toabout 300 nanometers and preferably from about 10 to about 80nanometers, and in contact therewith a low work function metal as acathode 7. In this EL device, a junction is formed between the holetransporting layer and the light emitting layer. In operation, when theanode is electrically biased to a positive potential with respect to thecathode, holes are injected into the organic hole transporting layer andtransported across this layer to the junction. Concurrently, electronsare injected from the cathode to the electron transport layer and aretransported toward the same junction. Recombination of holes andelectron occurs near the junction resulting in light emission.Optionally, the light emitting layer can contain more than oneluminescent hydrocarbon compound illustrated and encompassed by theFormulas recited herein, for example (I) and (II); and layered ELdevices with a light emitting layer comprised of a luminescentcomposition comprised of a hydrocarbon compound illustrated by, forexample, Formulas (I) and (II) as a host component capable of sustaininghole-electron recombination and a guest fluorescent material capable ofemitting light in response to energy released by the hole-electronrecombination.

DESCRIPTION OF EMBODIMENTS

[0038] In aspects thereof, the present invention relates to an organicelectroluminescent device comprised of an anode and a cathode, and an ELelement positioned between the anode and the cathode, wherein the ELelement has at least a light emitting layer containing a luminescenthydrocarbon compound of the Formula (I)

[0039] wherein R¹ and R² are substituents, which may be selected fromthe group consisting of hydrogen, an alkyl group with, for example, from1 to about 6 carbon atoms, an aryl group with about 6 to about 30 carbonatoms, an alkoxy group with preferably from 1 to about 6 carbon atoms, ahalogen, a cyano group and the like. Specific examples of substituentsfor R¹ and R² are hydrogen, methyl, tert-butyl, a phenyl, a biphenylyl,and the like; Ar¹ and Ar² in Formula (I) are each an aromatic component,such as an aryl group with, for example, about 4 to about 10conjugate-bonded or fused benzene rings, and which may be independentlyselected, for example, from the group consisting of those of thefollowing formulas

[0040] wherein R₁₁, R₁₂, R₁₃, R₁₄, and R₁₅ are each a substituentselected from the group consisting of hydrogen, an alkyl group with, forexample, preferably from 1 to about 6 carbon atoms, an alicyclic alkylgroup with from about 3 to about 15 carbon atoms, an alkoxy group with,for example, preferably from 1 to about 6 carbon atoms, a dialkylaminogroup with preferably from about 1 to about 3 carbon atoms, a halogen, acyano group and the like. Illustrative examples of alkyl group aremethyl, ethyl, tert-butyl and the like; illustrative examples ofalicyclic alkyl group are cyclopentyl, cyclohexyl,4-tert-butylcyclohexyl, and the like; typical examples of alkoxy groupinclude methoxy, ethoxy, isopropoxy, tert-butoxy, and the like. Usefulexamples of substituents for R₁₁, R₁₂, R₁₃, R₁₄, and R₁₅ includehydrogen, methyl, tert-butyl, cyclohexyl, methoxy, tert-butoxy,fluorine, cyano and the like.

[0041] Also, in embodiments the present invention is directed to anelectroluminescent device comprised of a first electrode like an anode,an organic electroluminescent element, and a second electrode like acathode wherein said electroluminescent element contains a fluorescenthydrocarbon component of Formula (I)

[0042] wherein R¹ and R² are substituents selected from the groupconsisting of hydrogen, an alkyl, an alicyclic alkyl, an alkoxy, ahalogen, and a cyano; Ar¹ and Ar² are each independently an aromaticcomponent or an aryl group comprised, for example, of from about 4 toabout 15 conjugate-bonded or fused benzene rings; an electroluminescentdevice wherein Ar¹ and Ar² are independently selected from the groupconsisting of

[0043] wherein R₁₁, R₁₂, R₁₃, R₁₄, and R₁₅ are each a substituentselected from the group consisting of hydrogen, alkyl with, for example,from 1 to about 6 carbon atoms, an alicyclic alkyl group with, forexample, from about 3 to about 15 carbon atoms, an alkoxy group withfrom 1 to about 6 carbon atoms, a dialkylamino group with from about 2to about 6 carbon atoms, a halogen, and a cyano group; anelectroluminescent device wherein the R¹ and R² are individuallyselected from the group consisting of methyl, ethyl, isopropyl,tert-butyl, cyclohexyl, 4-tert-butylcyclohexyl, methoxy, ethoxy,isopropoxy, tert-butoxy, dimethylamino, diethylamino, phenyl, tolyl,naphthyl, anthryl, phenylanthryl, diphenylanthryl, biphenylyl,phenylvinyl, diphenylvinyl, hydrogen, fluorine, chlorine, and cyano; anelectroluminescent device wherein the R₁₁, R₁₂, R₁₃, R₁₄, and R₁₅ areindividually selected from the group consisting of hydrogen, methyl,ethyl, isopropyl, tert-butyl, cyclohexyl, 4-tert-butylcyclohexyl,methoxy, ethoxy, isopropoxy, tert-butoxy, dimethylamino, diethylamino,fluorine, chlorine, and cyano; an electroluminescent device wherein thehydrocarbon component is selected from the group consisting of

[0044] an electroluminescent device comprised of an anode, an organicelectroluminescent element and a cathode, wherein the electroluminescentelement is situated between the anode and the cathode, and contains afluorescent hydrocarbon component of Formula (II)

[0045] wherein R¹ and R² are independently selected from the groupconsisting of hydrogen, an alkyl group, an alicyclic alkyl group, anaryl group, an alkoxy group, a halogen, and a cyano group; R³, R⁴, R⁵,and R⁶ are independently selected from the group consisting of hydrogen,an alkyl group, an alicyclic alkyl group, an aryl group, and an alkoxygroup, wherein R³ and R⁴, or R⁴ and R⁵ are optionally combined into abivalent hydrocarbon group selected from the group consisting of analkylene, an alkylidene, an alicyclic alkylidene, and an arylalkylidene,wherein Ar¹ and Ar² are independently an aryl group; and wherein Ar isan tetravalent aromatic group; an electroluminescent device wherein theR¹ and R² are individually selected from the group consisting of methyl,ethyl, cyclohexyl, tert-butyl, methoxy, ethoxy, tert-butoxy, phenyl,tolyl, hydrogene, fluorine, chlorine, and cyano; an electroluminescentdevice wherein the R³, R⁴, R⁵ and R⁶ are selected from the groupconsisting of hydrogen, methyl, ethyl, propyl, hexyl, cyclohexyl,tert-butyl, methoxy, ethoxy, 2-methoxyethyl, phenyl, tolyl,methoxyphenyl, cyclohexylidene, 4-tert-butylcyclohex ylidene,benzylidene, diphenylmethylidene, and mixtures thereof; anelectroluminescent device wherein Ar¹ and Ar² are selected from thegroup consisting of an aryl of phenyl, tolyl, tert-butylphenyl,methoxyphenyl, 3,5-diphenylphenyl, 3,5-bis(p-tert-butylphenyl)phenyl,biphenylyl, and 4′-methoxybiphenyl-4-yl, 2-phenylvinyl,2,2-diphenylvinyl, and trans-stilbenyl; an electroluminescent devicewherein R₁ to R₆ are each a substituent selected from the groupconsisting of hydrogen, an alkyl group with from 1 to about 6 carbonatoms, an alicyclic alkyl group with from about 3 to about 15 carbonatoms, an alkoxy group with from 1 to about 6 carbon atoms, adialkylamino group with from about 1 to about 3 carbon atoms, a halogen,and cyano; an electroluminescent device wherein the substituents for R₁to R₆ are individually selected from the group consisting of hydrogen,methyl, ethyl, isopropyl, tert-butyl, cyclohexyl,4-tert-butylcyclohexyl, methoxy, ethoxy, isopropoxy, tert-butoxy,dimethylamino, diethylamino, fluorine, chlorine, and cyano; anelectroluminescent device wherein the hydrocarbon component is selectedfrom the group consisting of

[0046] an electroluminescent device wherein the electroluminescentelement includes an emitting layer comprised of a host hydrocarboncompound comprised of Formula (I), (II), or mixtures thereof, and afluorescent dye; an electroluminescent device wherein the fluorescentdye possesses a bandgap no greater than that of the host material; anelectroluminescent device wherein the fluorescent dye is selected fromthe group consisting of coumarins, dicyanomethylene pyranes,polymethines, oxabenzanthranes, xanthenes, pyryliums, carbostyls,perylenes, acridones, quinacridone, and fused ring aromatic fluorescentdyes; an electroluminescent device wherein the fluorescent dye isselected from the group consisting of N-methyl-9-acridone,N-methyl-2-methoxy-9-acridone, N-methyl-2-phenoxy-9-acridone,N-methyl-2-t-butoxy-9-acridone, N-phenyl-2-methoxy-9-acridone,N-methyl-2-phenyl-9-acridone, N-methyl-2-diethylamino-9-acridone,perylene, terta-tert-butylperylene, rubrene, N,N′-dimethylquinacridone,N,N′-dimethyl-2-methylquinacridone,N,N′-dimethyl-2,9-dimethylquinacridone,N,N′-dimethyl-2-chloroquinacridone, N, N′-dimethyl-2-fluoroquinacridone,and N,N′-dimethyl-1,2-benzoquinacridone; an electroluminescent devicewherein the fluorescent dye is present in an amount of from about 10⁻³to about 10 mole percent based on the moles of the hydrocarbon hostmaterial; an organic electroluminescent device comprising in thefollowing sequence an anode, an optional buffer layer, a holetransporting layer, a light emitting layer comprised of a hydrocarboncompound of Formulas (I), (II) or mixtures thereof, an electrontransport layer, and a cathode; an electroluminescent device wherein thebuffer layer is comprised of a phthalocyanine derivative, and whereinthe hole transport layer is comprised of a tertiary aromatic amine; anelectroluminescent device wherein the tertiary aromatic amine isN,N′-di-1-naphthyl-N,N′-diphenyl-benzidine; an electroluminescent devicewherein the electron transport layer is comprised oftri(8-hydroxyquinolinato)aluminum; an electroluminescent device whereinthe electron transport layer is comprised of triazines, or a triazine;an electroluminescent device wherein the triazine is selected from thegroup consisting of4,4′-bis-[2-(4,6-diphenyl-1,3,5-triazinyl)]-1,1′-biphenyl,4,4′-bis-[2-(4,6-di-p-tolyl-1 ,3,5-triazinyl)]-1,1 ′-biphenyl,4,4′-bis-[2-(4,6-di-m-tolyl-1,3,5-triazinyl)]-1,1′-biphenyl,4,4′-bis-[2-(4,6-di-p-methoxyphenyl-1, 3, 5-triazinyl)]-1,1′-biphenyl,and 2,4,6-tri(1,1′-biphenyl-4-yl)-1,3,5-triazine; an electroluminescentdevice wherein the light emitting layer further includes a fluorescentdye; an electroluminescent device wherein the fluorescent dye isselected from the group consisting of 9-acridones, quinacridones, andperylenes; an electroluminescent device wherein the light emitting layeris comprised of a mixture of hydrocarbon compounds of Formulas (I),(II), or mixtures thereof, and wherein the second hydrocarbon (II) ispresent in an amount of from about 1 to about 50 mole percent based onthe mole percent of the first hydrocarbon compound, and wherein thetotal of (I) and (II) is about 100 percent; an electroluminescent devicewherein the anode is comprised of indium tin oxide in a thickness offrom about 1 to about 500 nanometers; the buffer layer is comprised of aphthalocyanine in a thickness of from about 5 to about 80 nanometers,the hole transport layer is comprised of a tertiary aromatic amine in athickness of from about 5 to about 300 nanometers; the light emittinghydrocarbon layer is of a thickness of about 5 to about 300 nanometers,and the cathode is comprised of a magnesium silver alloy or a lithiumaluminum alloy in a thickness of from about 10 to about 800 nanometers;an electroluminescent device wherein the element is a layer, the firstelectrode is an anode, and the second electrode is a cathode; anelectroluminescent device wherein the element is comprised of a layeredelectroluminescent arrangement comprised of a hole transport layer, anda light emitting layer wherein optionally hydrocarbon compounds areadded thereto, and an electron transport layer; and which element ispositioned in between the anode and cathode; an electroluminescentdevice wherein the element represents a single layer, a plurality oflayers, or a plurality of laminated layers; an electroluminescent devicewherein the electron transport layer is comprised oftri(8-hydroxyquinolinato)aluminum, or a triazine; an electroluminescentdevice wherein the light emitting layer further includes a fluorescentdye; an electroluminescent device and further including an electrontransport layer wherein the hole transport layer is comprised of atertiary aromatic amine; an electroluminescent device wherein the firstelectrode is an anode of indium tin oxide, the hole transport is atertiary aromatic amine, the light emitting hydrocarbon is of athickness of from about 5 to about 300 nanometers, and the secondelectrode is a cathode of a metal alloy; a compound of Formulas (I),(II), or mixtures thereof; a compound of the Formulas

[0047] wherein R¹ and R² are substituents, which are selected from thegroup consisting of hydrogen, an alkyl, an alicyclic alkyl, an alkoxy, ahalogen, and a cyano; Ar¹ and Ar² are each independently an aromaticcomponent or an aryl group comprised of a from about 4 to about 15conjugate-bonded or fused benzene rings; or

[0048] wherein R¹ and R² are independently selected from the groupconsisting of hydrogen, an alkyl group, an alicyclic alkyl group, anaryl group, an alkoxy group, a halogen, a cyano group; R³, R⁴, R⁵, andR⁶ are independently selected from the group consisting of hydrogen, analkyl group, an alicyclic alkyl group, an aryl group, and an alkoxygroup; wherein R³ and R⁴, or R⁴ and R⁵ are optionally combined into abivalent hydrocarbon group selected from the group consisting of analkylene, an alkylidene, an alicyclic alkylidene, and an arylalkylidene;wherein Ar¹ and Ar² are independently an aryl group; and wherein Ar is atetravalent aromatic group; an organic electroluminescent device whereinthe first electrode is an anode and the second electrode is a cathode.

[0049] Illustrative examples of the hydrocarbon compounds encompassed byFormula (I) include the following

[0050] The present invention also relates to an organicelectroluminescent device comprised of an anode and a cathode, and an ELelement positioned between the anode and the cathode, wherein said ELelement has at least one light emitting layer containing a luminescenthydrocarbon compound comprised of the Formula (II)

[0051] wherein R¹ and R² are substituents, which may be selected fromthe group consisting of hydrogen, an alkyl group with, for example, from1 to about 6 carbon atoms, an alicyclic alkyl group with from about 3 toabout 15 carbon atoms, an aryl group with about 6 to about 30 carbonatoms, an alkoxy group with preferably from 1 to about 6 carbon atoms, ahalogen, a cyano group and the like; illustrative examples of alkylgroup are methyl, ethyl, tert-butyl and the like. Illustrative examplesof alicyclic alkyl group are cyclopentyl, cyclohexyl,4-tert-butylcyclohexyl, and the like; examples of aryl for R¹ and R²include a phenyl, a tolyl, 4-tert-butylphenyl, and the like; typicalexamples of alkoxy group include methoxy, ethoxy, isopropoxy,tert-butoxy, and the like. R³, R⁴, R⁵, and R⁶ are each a substituent,which may be selected from the group consisting of hydrogen, an alkylgroup with, for example, from 1 to about 6 carbon atoms, an alicyclicalkyl group with from about 3 to about 15 carbon atoms, an aryl groupwith about 6 to about 30 carbon atoms, an alkoxy group with preferablyfrom 1 to about 6 carbon atoms, and the like. Illustrative examples ofsubstituents include hydrogen, methyl, ethyl, tert-butyl, cyclopentyl,cyclohexyl, 4-tert-butylcyclohexyl, a phenyl, a tolyl,4-tert-butylphenyl, 4-methoxyphenyl, methoxy, ethoxy, propoxy, butoxy,and the like. R³ and R⁴, or R⁴ and R⁵ may combined into a bivalenthydrocarbon group being selected from, for example, the group consistingof an alkylene group with from about 3 to about 8 carbon atoms, analkylidene group with from about 3 to about 15 carbon atoms, analicyclic alkylidene group with from about 3 to about 15 carbon atoms,and an arylalkylidene group with from about 6 to about 30 carbon atoms,and the like. Illustrative examples of bivalent group for R³ and R⁴, orR⁴ and R⁵ include 1,5-pentylene, 1,6-hexalene, ethylidene,phenylmethylidene, diphenylmethylidene, cyclohexalidene,4-tert-butylcyclohexalidene, and the like.

[0052] Ar¹ and Ar² are each an aromatic component, such as an aryl groupwith from about 6 to about 30 carbon atoms, or an arylvinyl group withfrom about 6 to about 30 carbon atoms, which may, for example, beselected from the group consisting of a phenyl, a biphenylyl, a3,5-diarylphenyl, a phenylvinyl, a diphenylvinyl, and the like.Illustrative examples of aryl groups for Ar¹ and Ar² are a phenyl,p-tert-butylphenyl, p-methoxyphenyl, 3,5-diphenylphenyl,3,5-bis(p-tert-butylphenyl)phenyl, biphenylyl, 4′-methoxybiphenyl-4-yl,2-phenylvinyl, 2,2-diphenylvinyl, and the like.

[0053] Ar for Formula (II) is in embodiments a tetravalent aromaticgroup with, for example, from about 6 to about 60 carbon atoms, andwhich group may be selected, for example, from the group consisting of

[0054] wherein R₁₁, R₁₂, and R₁₃ are each a substituent, which may beselected from the group consisting of hydrogen, an alkyl group with, forexample, from 1 to about 6 carbon atoms, an alicyclic alkyl group with,for example, from about 3 to about 15 carbon atoms, an alkoxy groupwith, for example, from about 1 to about 6 carbon atoms, a dialkylaminogroup with from about 1 to about 3 carbon atoms, a halogen, a cyanogroup and the like. Illustrative examples of substituents for R₁₁, R₁₂,R₁₃ include hydrogen, methyl, tert-butyl, cyclohexyl, methoxy,tert-butoxy, fluorine, cyano and the like.

[0055] Examples of specific hydrocarbon compounds illustrated by Formula(II) include

[0056] The hydrocarbon compounds may be generated by a number ofsynthetic processes. For example, they can be synthesized as follows: amixture consisting of one equivalent of a suitable dibromoarene compoundor an arene ditriflate compound, such as 4,4′-(9-fluorenylidene)diphenylditriflate, two equivalents of a base, such as potassium carbonate, twoequivalents of an arene diborate compound, such as9-anthryl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, 0.01 equivalent of apalladium catalyst, such as tetrakis(triphenylphosphine)palladium, andsuitable amounts of an inert solvent, such as dioxane, is heated underargon to reflux for a suitable time, about 48 hours. After cooling toroom temperature, about 23° C., the reaction contents are added intomethanol or water, and the precipitate is collected by filtration. Theproduct may further be purified by standard purification means includingrecrystallization and sublimation. The hydrocarbon compounds thusobtained may be confirmed by elemental analysis, NMR or IR spectrometricidentification techniques.

[0057] The luminescent hydrocarbon materials described herein exhibitstrong fluorescence in the solid state in the region from about 400nanometers to, for example, about 600 nanometers. They have the abilityof forming thin films with excellent thermal stability by vacuumevaporation.

[0058] In embodiments, the light emitting layer 5 disclosed herein mayfurther include a fluorescent material, wherein the layer is formed of aluminescent composition comprised of a hydrocarbon compound illustratedby Formulas through (I) or (II) as a host component and a guestfluorescent material. By mixing with the hydrocarbon host component asmall amount of a fluorescent material capable of emitting light inresponse to hole-electron recombination, improved device performancecharacteristics, such as emission hue and electroluminescent efficiency,may be achieved. The fluorescent material is present in an amount of,for example, from about 0.01 to about 10 weight percent, or from about10⁻³ to about 10 mole percent, based on the moles of the hydrocarbonhost material, and preferably from about 1 to about 5 weight percent ofthe host hydrocarbon component. Suitable fluorescent material employedas the guest component are those possessing, for example, a bandgap nogreater than that of said host component and a potential less negativethan that of the host component. The fluorescent materials can beblended with the host hydrocarbon material to form a common phase.

[0059] Illustrative examples of fluorescent materials are dyes selected,for example, from the group consisting of coumarin, dicyanomethylenepyranes, polymethine, oxabenzanthrane, xanthene, pyrylium, carbostyl,perylene, and the like; preferable examples of fluorescent materialsinclude acridone dyes such as N-methyl-9-acridone,N-methyl-2-methoxy-9-acridone, N-methyl-2-phenoxy-9-acridone,N-methyl-2-t-butoxy-9-acridone, N-phenyl-2-methoxy-9-acridone,N-methyl-2-phenyl-9-acridone, N-methyl-2-diethylamino-9-acridone, andthe like; a dye selected from the group consisting of quinacridonederivatives; illustrative examples of quinacridone dyes include ofN,N′-dimethylquinacridone, N,N′-dimethyl-2-methyl quinacridone,N,N′-dimethyl-2,9-dimethylquinacridone, N,N′-dimethyl-2-chloroquinacridone, N, N′-dimethyl-2-fluoroquinacridone,and N,N′-dimethyl-1,2-benzoquinacridone, and the like. Also, anotherpreferred class of fluorescent materials is fused ring fluorescent dyes.Examples of the fused ring fluorescent dyes include perylene,tetra-t-butylperylene, rubrene, anthracene, coronene, phenanthrecene,pyrene and the like, as illustrated in U.S. Pat. No. 3,172,862, thedisclosure of which is totally incorporated herein by reference. Also,fluorescent materials that can be selected as a dopant includebutadienes, such as 1,4-diphenylbutadiene, tetraphenylbutadiene,stilbenes, and the like, as illustrated in U.S. Pat. Nos. 4,356,429 and5,516,577, the disclosures of which are totally incorporated herein byreference.

[0060] The light emitting layer herein may be formed by any convenientmanner. For example, it can be prepared by vacuum deposition from theevaporation of the luminescent hydrocarbon compound, or from thesimultaneous evaporation of the hydrocarbon host material and thefluorescent material. The thickness of the light emitting layer is notparticularly limited, and can range from about 5 nanometers to about 300nanometers, or from about 10 nanometers to about 100 nanometers.

[0061] It is desirable that the organic EL devices of the presentinvention comprise a supporting substrate. Illustrative examples of thesupporting substrate include polymeric components, glass, and the like,and polyesters like MYLAR®, polycarbonates, polyacrylates,polymethacrylates, polysulfones, quartz, and the like. Other substratescan also be selected provided, for example, they can effectively supportthe other layers, and that it does not interfere with the devicefunctional performance. The thickness of the substrate can be, forexample, from about 25 to about 1,000 microns or more, and for example,from about 50 to about 500 microns depending, for example, on thestructural demands of the device.

[0062] Examples of the anode, which is contiguous to the substrate,include positive charge injecting electrodes, such as indium tin oxide,tin oxide, gold, platinum, or other suitable materials, such aselectrically conductive carbon, π-conjugated polymers such aspolyaniline, polypyrrole, and the like with, for example, a workfunction equal to, or greater than about 4 electron volts, and morespecifically, from about 4 to about 6 electron volts. The thickness ofthe anode can range from about 1 to about 5,000 nanometers with thepreferred range being dictated by the optical constants of the anodematerial. One preferred range of thickness is from about 30 to about 100nanometers.

[0063] The buffer layer is optional, and which layer primarily functionsto achieve desirable charge injection of holes from the anode, and toimprove the adhesion between the anode and the organic hole transportinglayer, thus further improving the device operation stability. Specificexamples of buffer layer materials include conductive materials, such aspolyaniline and its acid-doped forms, polypyrrole, poly(phenylenevinylene), and known semiconductive organic materials; porphyrinderivatives disclosed in U.S. Pat. No. 4,356,429, such as1,10,15,20-tetraphenyl-21H,23H-porphyrin copper (II); copperphthalocyanine, copper tetramethyl phthalocyanine; zinc phthalocyanine;titanium oxide phthalocyanine; magnesium phthalocyanine; and the like,the disclosures of each of these patents being totally incorporatedherein by reference.

[0064] A class of hole transporting materials that can be selected forthe buffer layer are the aromatic tertiary amines, such as thosedisclosed in U.S. Pat. No. 4,539,507, the disclosure of which is totallyincorporated herein by reference. Representative examples of aromatictertiary amines are bis(4-dimethylamino-2-methylphenyl)phenylmethane, N,N, N-tri(p-tolyl)am ine, 1,1-bis(4-di-p-tolylaminophenyl)cyclohexane,1,1-bis(4-di-p-tolylamino phenyl)-4-phenyl cyclohexane,N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine, N,N′-diphenyl-N, N′-bis(3-methylphenyl)-1 ,1 ′-biphenyl-4,4′-diamine,N,N′-diphenyl-N,N′-bis(4-methoxyphenyl)-1,1′-biphenyl-4,4′-diamine,N,N,N′,N′-tetra-p-tolyl-1,1′-biphenyl-4,4′-diamine,N,N′-di-1-naphthyl-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine, and thelike. Another class of aromatic tertiary amines selected for the holetransporting layer is polynuclear aromatic amines, such asN,N-bis-[4′-(N-phenyl-N-m-tolylamino)-4-biphenylyl]an iline; N,N-bis-[4′-(N-phenyl-N-m-tolylam ino)-4-biphenylyl]-m-toluidine;N,N-bis-[4′-(N-phenyl-N-m-tolylamino)-4-biphenylyl]-p-toluidine;N,N-bis-[4′-(N-phenyl-N-p-tolylamino)-4-biphenylyl]aniline;N,N-bis-[4′-(N-phenyl-N-p-tolylamino)-4-biphenylyl]-m-toluidine;N,N-bis-[4′-(N-phenyl-N-p-tolylamino)-4-biphenylyl]-p-toluidine;N,N-bis-[4′-(N-phenyl-N-p-chlorophenylamino)-4-biphenylyl]-m-toluidine;N,N-bis-[4′-(N-phenyl-N-m-chlorophenylamino)-4-biphenylyl]-m-tolu idine;N,N-bis-[4′-(N-phenyl-N-m-chlorophenylamino)-4-biphenylyl]-p-toluidine;N,N-bis-[4′-(N-phenyl-N-m-tolylamino)-4-biphenylyl]-p-chloroaniline;N,N-bis-[4′-(N-phenyl-N-p-tolylamino)-4-biphenylyl]-m-chloroaniline;N,N-bis-[4′-(N-phenyl-N-m-tolylamino)-4-biphenylyl]-1-aminonaphthaleneand the like.

[0065] The buffer layer comprised of aromatic tertiary amines describedherein may further include, as disclosed in U.S. Pat. No. 5,846,666, thedisclosure of which is totally incorporated herein by reference, astabilizer comprised of certain hydrocarbon compounds, such as rubrene,4,8-diphenylanthracene, and the like. The buffer layer can be preparedby forming a suitable compounds into thin film by known methods, such asvapor deposition or spin-coating. The thickness of buffer layer thusformed is not particularly limited, and can be in a range of from about5 nanometers to about 300 nanometers, and preferably from about 10nanometers to about 100 nanometers.

[0066] The hole transporting layers can be comprised of a holetransporting material with a thickness ranging, for example, from about1 nanometer to about 200 nanometers, and preferably from about 5nanometers to about 100 nanometers. This layer can reduce the drivingvoltage of the device and improve the confinement of the injected chargerecombination within the hydrocarbon light emitting layer. Anyconventional suitable aromatic amine hole transporting materialsdescribed for the buffer layer may be selected for forming this layer.

[0067] A preferred class of hole transporting materials selected forforming the hole transporting layer is comprised ofN,N,N′,N′-tetraarylbenzidine derivatives. Illustrative examples ofbenzidine derivatives include N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine, N,N′-diphenyl-N,N′-bis(4-methoxyphenyl)-1,1′-biphenyl-4,4′-diamine,N,N,N′,N′-tetra-p-tolyl-1,1′-biphenyl-4,4′-diamine,N,N′-1-naphthyl-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine and the like.

[0068] The electron optional transporting layer selected for the primarypurpose of improving the electron injection characteristics and theemission uniformity of the EL devices of the present invention are of asuitable thickness, for example from about 1 nanometer to about 300nanometers, or from about 5 nanometers to about 100 nanometers.Illustrative examples of electron transporting compounds, which can beutilized in this layer, include the metal chelates of 8-hydroxyquinolineas disclosed in U.S. Pat. Nos. 4,539,507; 5,151,629, and 5,150,006, thedisclosures of which are totally incorporated herein by reference.Illustrative examples include tris(8-hydroxyquinolinate) aluminum, apreferred one, tris(8-hydroxyquinolinate) gallium,bis(8-hydroxyquinolinate) magnesium, bis(8-hydroxyquinolinate) zinc,tris(5-methyl-8-hydroxyquinolinate) aluminum,tris(7-propyl-8-quinolinolato) aluminum,bis[benzo{f}-8-quinolinate]zinc, bis(10-hydroxybenzo[h]quinolinate)beryllium, and the like. Another class of metal chelate compounds forelectron transport layer is the oxadiazole metal chelates disclosed inU.S. Pat. No. 5,925,472, the disclosures of which are totallyincorporated herein by reference.

[0069] Another class of electron transport materials comprises triazinecompounds as disclosed in U.S. Pat. No. 6,057,048, the disclosure ofwhich is totally incorporated herein by reference. Illustrative specificexamples include4,4′-bis-[2-(4,6-diphenyl-1,3,5-triazinyl)]-1,1′-biphenyl,4,4′-bis-[2-(4,6-di-p-tolyl-1,3,5-triazinyl)]-1,1′-biphenyl,4,4′-bis-[2-(4,6-d i-m-tolyl-1, 3,5-triazinyl)]-1,1′-biphenyl,4,4′-bis-[2-(4,6-di-p-anisyl-1,3,5-triazinyl)]-1,1′-biphenyl,4,4′-bis-[2-(4-β-naphthyl-6-phenyl-1,3,5-triazinyl)]-1,1′-biphenyl,4,4′-bis-[2-(4,6-d i-biphenylyl-1,3,5-triazinyl)]-1,1′-biphenyl,4,4′-bis-[2-(4,6-di-phenyl-1,3,5-triazinyl)]-2,2′-dimethyl-1,1′-biphenyl,4,4′-bis-[2-(4,6-di-phenyl-1,3,5-triazinyl)]-stilbene,4,4′-bis-[2-(4-phenyl-6-p-tolyl-1,3,5-triazinyl)]-stilbene,2,4,6-tri(4-biphenylyl)-1,3,5-triazine, and the like.

[0070] The cathode can be comprised of any metal, including high, forexample from about 4.0 eV to about 6.0 eV, or low work functioncomponent, such as metals with, for example, an eV of from about 2.5 eVto about 4.0 eV (electron volts). The cathode can be derived from acombination of a low work function metal (less than about 4 eV) and atleast one other metal. Effective proportions of the low work functionmetal to the second or other metal are from less than about 0.1 percentto about 99.9 percent by weight. Illustrative examples of low workfunction metals include alkaline metals such as lithium or sodium, Group2A or alkaline earth metals such as beryllium, magnesium, calcium, orbarium, and Group III metals including rare earth metals and theactinide group metals such as scandium, yttrium, lanthanum, cerium,europium, terbium, or actinium. Lithium, magnesium and calcium arepreferred low work function metals.

[0071] The thickness of cathode ranges from, for example, about 10nanometers to about 500 nanometers. The Mg:Ag cathodes of U.S. Pat. No.4,885,211, the disclosure of which constitutes one preferred cathode,can be selected for the EL devices of the present invention. Anothercathode construction is described in U.S. Pat. No. 5,429,884, thedisclosure of which are totally incorporated herein by reference,wherein the cathodes are, for example, formed from lithium alloys withother high work function metals such as aluminum and indium.

[0072] Both the anode and cathode of the EL devices of the presentinvention may contain a protective coating thereon, and the anode andcathode can be of any convenient forms. A thin conductive layer can becoated onto a light transmissive substrate, for example a transparent orsubstantially transparent glass plate or plastic film. The EL device caninclude a light transmissive anode formed from tin oxide or indium tinoxide coated on a glass plate. Also, very thin, for example less thanabout 200 Å, and more specifically, from about 75 to about 150Angstroms, light-transparent metallic anodes can be used, such as gold,palladium, and the like. In addition, transparent or semitransparentthin layers, for example from 50 to about 175 Angstroms of conductivecarbon or conjugated polymers such as polyaniline, polypyrrole, and thelike can be used as anodes. Any suitable light transmissive polymericfilm can be employed as the substrate. Additional suitable forms of theanode 3 and cathode 6 are illustrated in U.S. Pat. No. 4,885,211.

[0073] Aromatic refers, for example, to aryl, such as phenyl, and whicharyl can contain, for example, from about 6 to about 72 carbon atoms;aliphatic refers, for example, to aklyl, and alkoxy, each with fromabout 1 to about 40, preferably about 25, and most preferably from about1 to about 6 carbon atoms; halogen refers, for example, to chloride,bromide, fluoride or iodide, and n is from about zero (0) to about 3.

[0074] The following Examples are provided to further illustrate variousspecies of the present invention, it being noted that these Examples areintended to illustrate and not limit the scope of the present invention.

EXAMPLE I Synthesis of 9-anthryl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane

[0075] To a solution of 9-bromoanthracene (9.73 grams) in 100milliliters of anhydrous diethyl ether were slowly added at about 0° C.23 milliliters of 2M n-butyllithium hexane solution. After the addition,the reaction mixture was warmed to room temperature (about 23° C.) for30 minutes. The resulting mixture was then cooled to around −30° C. and2-isopropoxy-4,4,5,5-tetramethyl-1,3,3-dioxaborolane (9.27 milliliters)was added through a syringe. The resulting reaction mixture was warmedto room temperature (about 23° C.), and stirred overnight (about 18hours throughout). After being diluted with 50 milliliters of hexane,the mixture resulting was filtered through celite. Removal of thesolvents under reduced pressure yielded a yellowish solid (6.70 grams)which contains more than 90 percent of9-anthryl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane. The product may beused without further purification. This compound and its structure wasconfirmed by proton NMR analysis.

EXAMPLE II Synthesis of 4,4′-(9-fluorenylidene)diphenyl Ditriflate

[0076] To a solution of 4,4′-(9-fluorenyledene)diphenol (10 grams) in100 milliliters of anhydrous pyridine were added at about 5° C. grams 11milliliters of triflic acid anhydride. After the addition, the reactionmixture was warmed to room temperature (about 23° C.) for 6 hours. Afterremoval of the pyridine under reduced pressure, the residue wasdissolved in 200 milliliters of dichloromethane, washed with 5 percentHCI aqueous solution, followed by washing with water. After removal ofthe solvents, the resulting crude residue was purified through a silicacolumn to yield 17.26 grams of 4,4′-(9-fluorenylidene)diphenylditriflate. This compound and its structure was confirmed by proton NMRanalysis.

EXAMPLE III Synthesis of 9,9-bis[4-(9-anthryl)phenyl) fluorene

[0077] A mixture of 9-anthryl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (5grams), 4,4′-(9-fluorenylidene)diphenyl ditriflate (5.3 grams),potassium carbonate (2.27 grams) in 50 milliliters of dioxane was purgedwith argon for 10 minutes. To this mixture was then addedtetrakis(triphenylphosphine) palladium (0.37 gram). The reaction mixturewas stirred at reflux for 48 hours under argon. After cooling to roomtemperature (about 23° C.), the mixture was diluted with 30 millilitersof methanol, and the precipitates were collected by filtration, washedwith 5 percent HCl aqueous solution, followed by water to removeinorganic salts. After drying, the filtrates were purified bysublimation to yield 2.5 grams of 9,9-bis[4-(9-anthryl)phenyl) fluorene.This compound had a melting point of 425° C. The structure of thiscompound was confirmed by proton NMR and elemental analysis.

EXAMPLE IV Synthesis of 10-bromo-9-phenylanthracene

[0078] To a solution of 9-phenylanthracene (10 grams) and ferricchloride (0.065 gram) in 100 milliliters of dichloromethane were added6.70 grams of bromine in 30 milliliters of dichloromethane through anaddition funnel at room temperature. The reaction mixture was stirredfor 3 hours, and then washed with aqueous sodium thiosulfate and water.After removal of the solvents, the crude residue was recrystallized fromethanol to yield 12.5 grams of 10-bromo-9-phenylanthracene. Thestructure of this compound was confirmed by proton NMR analysis.

EXAMPLE V Synthesis of9-(10-phenylanthryl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane

[0079] To a solution of 10-bromo-9-phenylanthracene (8.69 grams) in 100milliliters of anhydrous diethyl ether were slowly added at about 0° C.16 milliliters of 2M n-butyllithium hexane solution. After the addition,the reaction mixture was warmed to room temperature (about 23° C.) for30 minutes. The resulted mixture was then cooled to around −30° C. and2-isopropoxy-4,4,5,5-tetramethyl-1,3,3-dioxaborolane (6.49 milliliters)was added through a syringe. The reaction mixture was warmed to roomtemperature (about 230C), and stirred overnight, about 18 hours. Afterbeing diluted with 50 milliliters of hexane, the mixture was filteredthrough celite. Removal of the solvents under reduced pressure yielded ayellowish solid (7.90 grams) which contains more than 90 percent of9-(10-phenylanthryl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane. Theproduct may be used without further purification. The structure of thiscompound was confirmed by proton NMR analysis.

EXAMPLE VI Synthesis of 9,9-bis[4-(10-phenyl-9-anthryl)phenyl]fluorene

[0080] A mixture of9-(10-phenylanthryl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (3.8grams), 4,4′-(9-fluorenylidene)diphenyl ditriflate (3.23 grams),potassium carbonate (1.38 grams) in 50 milliliters of dioxane was purgedwith argon for 10 minutes. To this mixture was then addedtetrakis(triphenylphosphine)palladium (0.23 gram). The reaction mixturewas stirred at reflux for 48 hours under argon. After cooling to roomtemperature (about 23° C.), the mixture was diluted with 30 millilitersof methanol, and the precipitates were collected by filtration, washedwith 5 percent HCl aqueous solution followed by washing with water toremove inorganic salts. After drying, the filtrates were purified bysublimation to yield 1.5 grams of 9,9-bis[4-(9-anthryl)phenyl) fluorene,with a melting point of 51 8° C. The structure of this compound wasconfirmed by proton NMR and elemental analysis.

EXAMPLE VII Synthesis of6,6,12,12-tetramethyl-2,8-diphenylindeno[1,2b]fluorene

[0081] This compound may be prepared in accordance to the proceduredescribed in J. Org. Chem., Vol. 56, 1210 (1991)(2,8-diphenyl-6,12-dihydroindeno[1,2b]fluorene, followed bymethylation).

EXAMPLE VIII

[0082] Organic EL devices comprising a light emitting layer of afluorescent hydrocarbon compound of Formulas I, II or mixtures thereof,and more specifically, with the hydrocarbon of Example III can befabricated in the following manner:

[0083] 1. A 500 Å indium tin oxide (ITO) anode coated glass substratewas selected, the thickness of the glass substrate being about 1millimeter. The glass was cleaned with a commercial detergent, rinsedwith deionized water and dried in a vacuum oven at 60° C. for 1 hour.Immediately before use, the glass was treated with UV ozone for 0.5hour.

[0084] 2. The ITO anode coated on the glass substrate was then placed ina vacuum deposition chamber, and a buffer layer was applied. The bufferlayer deposition rate and layer thickness were controlled by an InficonModel IC/5 controller. Under a pressure of about 5×10⁻⁶ Torr, a 15nanometers thick buffer layer was deposited on the ITO glass substratethrough evaporation of copper (II) phthalocyanine at a rate of 0.6nanometer/second from a tantalum boat.

[0085] 3. Onto the buffer layer, a 20 nanometers thick hole transportlayer of N,N′-1-naphthyl-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine wasdeposited at a rate of 0.6 nanometer/second.

[0086] 4. Onto the hole transport layer was deposited by evaporation a40 nanometers light emitting layer of9,9-bis[4-(9-anthryl)phenyl)fluorene at a rate of 0.6 nanometer/second.

[0087] 5. A 20 nanometers thick electron transport layer of4,4′-bis-[2-(4,6-diphenyl-1,3,5-triazinyl)]-1,1′-biphenyl was thendeposited by evaporation at a rate of 0.6 nanometer/second onto thelight emitting layer.

[0088] 6. A 100 nanometer cathode of a magnesium silver alloy wasdeposited at a total deposition rate of 0.5 nanometer/second onto thelight emitting layer above by the simultaneous evaporation from twoindependently controlled tantalum boats containing Mg and Ag,respectively. A typical composition was 9:1 in atomic ratio of Mg to Ag.Finally, a 200 nanometer silver layer was overcoated on the Mg:Agcathode for the primary purpose of protecting the reactive Mg fromambient moisture.

[0089] The EL device as prepared above were retained in a dry box whichwas continuously purged with nitrogen gas; their performance thereof wasassessed by measuring the current-voltage characteristics and lightoutput under a direct current measurement. The current-voltagecharacteristics were determined with a Keithley Model 238 High CurrentSource Measure Unit. The ITO electrode was always connected to thepositive terminal of the current source. At the same time, the lightoutput from the device was monitored by a silicon photodiode.

[0090] The light output from this device was 350 cd/m² when it wasdriven by a direct current of 25 mA/cm². The device emitted a blueemission with CIE color coordinates of X=0.158 and Y=0.151 measured byMinolta Chromameter CS-100.

EXAMPLE IX

[0091] This organic EL device utilizes an electron transport layercomprised of a triazine and tri(8-hydroxyquinolinato)aluminum. Theprimary purpose of using triazine herein is to improve the chromaticitycoordinates of blue emission color. The device can be fabricated in thefollowing manner:

[0092] 1. A 500 Å indium tin oxide (ITO) anode coated glass substratewas selected, the thickness of the glass substrate being about 1millimeter. The glass was cleaned with a commercial detergent, rinsedwith deionized water and dried in a vacuum oven at 60° C. for 1 hour.Immediately before use, the glass was treated with UV ozone for 0.5hour.

[0093] 2. The ITO anode coated on the glass substrate was then placed ina vacuum deposition chamber, and a hole transport layer was applied. Thehole transport layer deposition rate and layer thickness were controlledby an Inficon Model IC/5 controller. Under a pressure of about 5×10⁻⁶Torr, a 30 nanometers thick hole transport layer ofN,N′-1-naphthyl-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine was depositedat a rate of 0.6 nanometer/second from a tantalum boat.

[0094] 3. Onto the hole transport layer was deposited a 40 nanometerslight emitting layer of 9,9-bis[4-(9-anthryl)phenyl)fluorene at a rateof 0.6 nanometer/second.

[0095] 4. A total 30 nanometers thick electron transport layer wasdeposited onto the light emitting layer through first evaporation of a10 nanometers thick layer of tris(1,1′-biphenyl-4-yl)-1,3,5-triazine ata rate of 0.6 nanometer/second, followed by evaporation of a 20nanometers thick layer of tri(8-hydroxyquinolinato)aluminum at the samerate.

[0096] 5. A 100 nanometer cathode of a magnesium silver alloy wasdeposited at a total deposition rate of 0.5 nanometer/second onto thelight emitting layer above by the simultaneous evaporation from twoindependently controlled tantalum boats containing Mg and Ag,respectively. A typical composition was 9:1 in atomic ratio of Mg to Ag.Finally, a 200 nanometer silver layer was overcoated on the Mg:Agcathode for the primary purpose of protecting the reactive Mg fromambient moisture.

[0097] The light output from this device was 380 cd/m² when it wasdriven by a direct current of 25 mA/cm². The device emitted a blueemission with CIE color coordinates of X=0.156 and Y=0.140 measured byMinolta Chromameter CS-100.

EXAMPLES X TO XIII

[0098] These Examples illustrated organic EL devices containing a lightemitting layer comprised of a hydrocarbon host material and afluorescent guest material. The devices were fabricated in the followingmanner:

[0099] 1. A 500 Å indium tin oxide (ITO) anode coated glass substratewas selected, the thickness of the glass substrate being about 1millimeter. The glass cleaned with a commercial detergent, rinsed withdeionized water and dried in a vacuum oven at 60° C. for 1 hour.Immediately before use, the glass was treated with UV ozone for 0.5hour.

[0100] 2. The ITO anode coated on the glass substrate was then placed ina vacuum deposition chamber, and a hole transport layer was applied. Thehole transport layer deposition rate and layer thickness were controlledby an Inficon Model IC/5 controller. Under a pressure of about 5×10⁻⁶Torr, a 30 nanometers thick hole transport layer was deposited on theITO glass substrate through evaporation ofN,N′-1-naphthyl-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine at a rate of0.6 nanometer/second from a tantalum boat.

[0101] 3. Onto the hole transport layer were deposited a 42 nanometersthick light emitting layer through simultaneous evaporation from twoindependently controlled tantalum boats of9,9-bis[4-(9-anthryl)phenyl]fluorene at a rate of 0.6 nanometer/second,and N-methyl-2-methoxy-9-acridone at such a rate that 1.6 weight percentor parts of this dye was doped.

[0102] 4. A total 30 nanometers thick electron transport layer wasdeposited onto the light emitting layer through first evaporation of a10 nanometers thick layer of tris(1,1′-biphenyl-4-yl)-1,3,5-triazine ata rate of 0.6 nanometer/second, followed by evaporation of a 20nanometers thick layer of tri(8-hydroxyquinolinato)aluminum at the samerate.

[0103] 5. A 100 nanometer cathode of a magnesium silver alloy wasdeposited at a total deposition rate of 0.5 nanometer/second onto thelight emitting layer above by the simultaneous evaporation from twoindependently controlled tantalum boats containing Mg and Ag,respectively. A typical composition was 9:1 in atomic ratio of Mg to Ag.Finally, a 200 nanometer silver layer was overcoated on the Mg:Agcathode for the primary purpose of protecting the reactive Mg fromambient moisture.

[0104] The light output and CIE color coordinates from these deviceswere measured at a direct current of 25 mA/cm². The results are shown inthe following Table. Light output Dopant (cd/m{circumflex over ( )}2)Example (percent) (25 mA/cm{circumflex over ( )}2) CIE (X, Y) X 0 3500.159, 0.147 XI 0.27 414 0.155, 0.133 XII 0.8 395 0.152, 0.122 XIII 1.6373 0.150, 0.112

EXAMPLE XIV

[0105] This EL device was fabricated in accordance with, that isrepeating the process of Example VIII except that9,9-bis[4-(10-phenyl-9-anthryl)phenyl]fluorene was used in place of9,9-bis[4-(9-anthryl)phenyl]fluorene to form the light emitting layer.The light output from this organic EL device was 330 cd/m² when it wasdriven by a direct bias voltage of 8 volts. The device emitted agreenish blue color.

EXAMPLE XV

[0106] This Example illustrates an organic EL device containing alight-emitting layer comprised of a mixture of hydrocarbon compounds.The device was fabricated in accordance with Example VIII except thatthe light emitting layer described in Step 4 further included ahydrocarbon compound of 9,9-bis[4-(10-phenyl-9-anthryl)phenyl]fluorene.Thus, there were deposited onto the hole transporting layer throughsimultaneous evaporation 75 parts of9,9-bis[4-(9-anthryl)phenyl]fluorene at a rate of 0.6 nanometer/secondand 25 weight percent or parts of9,9-bis[4-(10-phenyl-9-anthryl)phenyl]fluorene at a rate of 0.2nanometer/second from two independently controlled tantalum boats. Whendriven by a direct bias voltage of 25 mA/cm², this organic EL deviceprovided a blue emission of about 380 cd/m².

EXAMPLE XVI

[0107] This EL device was fabricated in accordance with Example VIIIexcept that 6,6,12,12-tetramethyl-2,8-diphenylindeno[1,2b]fluorene wasused in place of 9,9-bis[4-(9-anthryl)phenyl]fluorene to form the lightemitting layer. When driven by a direct bias voltage of 25 mA/cm², thisorganic EL device provided a blue emission of about 320 cd/m².

EXAMPLE XVII

[0108] This Example illustrates an organic EL device containing alight-emitting layer comprised of a mixture of hydrocarbon compounds.The device was fabricated in accordance with Example VIII except thatonto the hole transporting layer was deposited a 40 nanometers thicklight emitting layer through simultaneous evaporation of about 85 weightpercent of 6,6,12,1 2-tetramethyl-2,8-diphenylindeno[1,2b]fluorene at arate of 0.6 nanometer/second and about 15 weight percent or parts of9,9-bis[4-(10-phenyl-9-anthryl)phenyl]fluorene at a rate of 0.1nanometer/second from two independently controlled tantalum boats. Whendriven by a direct bias voltage of 25 mA/cm², this organic EL deviceprovided a blue emission of about 370 cd/m².

[0109] Other modifications of the present invention will or may occur tothose of ordinary skill in the art subsequent to a review of the presentapplication. These modifications and equivalents thereof are intended tobe included within the scope of the present invention.

What is claimed is:
 1. An electroluminescent device comprised of a first electrode, an organic electroluminescent element, and a second electrode wherein said electroluminescent element contains a fluorescent hydrocarbon component of Formula (I)

wherein R¹ and R² are substituents selected from the group consisting of hydrogen, an alkyl, an alicyclic alkyl, an alkoxy, a halogen, and a cyano; Ar¹ and Ar² are each independently an aromatic component or an aryl group comprised of from about 4 to about 15 conjugate-bonded or fused benzene rings.
 2. An electroluminescent device in accordance with claim 1 wherein said Ar¹ and Ar² are independently selected from the group consisting of

wherein R₁₁, R₁₂, R₁₃, R₁₄, and R₁₅ are each a substituent selected from the group consisting of hydrogen, alkyl with from 1 to about 6 carbon atoms, an alicyclic alkyl group with from about 3 to about 15 carbon atoms, an alkoxy group with from 1 to about 6 carbon atoms, a dialkylamino group with from about 2 to about 6 carbon atoms, a halogen, and a cyano group.
 3. An electroluminescent device in accordance with claim wherein said R¹ and R² are individually selected from the group consisting methyl, ethyl, isopropyl, tert-butyl, cyclohexyl, 4-tert-butylcyclohexyl, thoxy, ethoxy, isopropoxy, tert-butoxy, dimethylamino, diethylamino, enyl, tolyl, naphthyl, anthryl, phenylanthryl, diphenylanthryl, biphenylyl, nylvinyl, diphenylvinyl, hydrogen, fluorine, chlorine, and cyano.
 4. An electroluminescent device in accordance with claim wherein said R₁₁, R₁₂, R₁₃, R₁₄, and R₁₅ are individually selected from the oup consisting of hydrogen, methyl, ethyl, isopropyl, tert-butyl, cyclohexyl, ert-butylcyclohexyl, methoxy, ethoxy, isopropoxy, tert-butoxy, ethylamino, diethylamino, fluorine, chlorine, and cyano.
 5. An electroluminescent device in accordance with claim 1 wherein said hydrocarbon component is selected from the group consisting of


6. An electroluminescent device comprised of an anode, an organic electroluminescent element and a cathode, wherein said electroluminescent element is situated between said anode and said cathode, and contains a fluorescent hydrocarbon component of Formula (II)

wherein R¹ and R² are independently selected from the group consisting of hydrogen, an alkyl group, an alicyclic alkyl group, an aryl group, an alkoxy group, a halogen, and a cyano group; R³, R⁴, R⁵, and R⁶ are independently selected from the group consisting of hydrogen, an alkyl group, an alicyclic alkyl group, an aryl group, and an alkoxy group, wherein R³ and R⁴, or R⁴ and R⁵ are optionally combined into a bivalent hydrocarbon group selected from the group consisting of an alkylene, an alkylidene, an alicyclic alkylidene, and an arylalkylidene, wherein Ar¹ and Ar² are independently an aryl group; and wherein Ar is an tetravalent aromatic group.
 7. An electroluminescent device in accordance with claim 6 wherein said R¹ and R² are individually selected from the group consisting of methyl, ethyl, cyclohexyl, tert-butyl, methoxy, ethoxy, tert-butoxy, phenyl, tolyl, hydrogene, fluorine, chlorine, and cyano.
 8. An electroluminescent device in accordance with claim 6 wherein said R³, R⁴, R⁵ and R⁶ are selected from the group consisting of hydrogen, methyl, ethyl, propyl, hexyl, cyclohexyl, tert-butyl, methoxy, ethoxy, 2-methoxyethyl, phenyl, tolyl, methoxyphenyl, cyclohexylidene, 4-tert-butylcyclohexylidene, benzylidene, diphenylmethylidene, and mixtures thereof.
 9. An electroluminescent device in accordance with claim 6 wherein said Ar¹ and Ar² are selected from the group consisting of an aryl of phenyl, tolyl, tert-butylphenyl, methoxyphenyl, 3,5-diphenylphenyl, 3,5-bis(p-tert-butylphenyl)phenyl, biphenylyl, and 4′-methoxybiphenyl-4-yl, 2-phenylvinyl, 2,2-diphenylvinyl, and trans-stilbenyl.
 10. An electroluminescent device in accordance with claim 6 wherein R₁ to R₆ are each a substituent selected from the group consisting of hydrogen, an alkyl group with from 1 to about 6 carbon atoms, an alicyclic alkyl group with from about 3 to about 15 carbon atoms, an alkoxy group with from 1 to about 6 carbon atoms, a dialkylamino group with from about 1 to about 3 carbon atoms, a halogen, and cyano.
 11. An electroluminescent device in accordance with claim 6 wherein said substituents for R₁ to R₆ are individually selected from the group consisting of hydrogen, methyl, ethyl, isopropyl, tert-butyl, cyclohexyl, 4-tert-butylcyclohexyl, methoxy, ethoxy, isopropoxy, tert-butoxy, dimethylamino, diethylamino, fluorine, chlorine, and cyano.
 12. An electroluminescent device in accordance with claim 6 wherein said hydrocarbon component is selected from the group consisting of


13. An electroluminescent device in accordance with claim 1 wherein said electroluminescent element includes an emitting layer comprised of a host hydrocarbon compound comprised of Formula (I), (II), or mixtures thereof, and a fluorescent dye.
 14. An electroluminescent device in accordance with claim 13 wherein said fluorescent dye possesses a bandgap no greater than that of the host material.
 15. An electroluminescent device in accordance with claim 13 wherein said fluorescent dye is selected from the group consisting of coumarins, dicyanomethylene pyranes, polymethines, oxabenzanthranes, xanthenes, pyryliums, carbostyls, perylenes, acridones, quinacridone, and fused ring aromatic fluorescent dyes.
 16. An electroluminescent device in accordance with claim 13 wherein said fluorescent dye is selected from the group consisting of N-methyl-9-acridone, N-methyl-2-methoxy-9-acridone, N-methyl-2-phenoxy-9-acridone, N-methyl-2-t-butoxy-9-acridone, N-phenyl-2-methoxy-9-acridone, N-methyl-2-phenyl-9-acridone, N-methyl-2-diethylamino-9-acridone, perylene, terta-tert-butylperylene, rubrene, N,N′-dimethylquinacridone, N,N′-dimethyl-2-methylquinacridone, N,N′-dimethyl-2, 9-dimethylquinacridone, N,N′-dimethyl-2-chloroquinacridone, N,N′-d imethyl-2-fluoroquinacridone, and N,N′-dimethyl-1 ,2-benzoqu inacridone.
 17. An electroluminescent device in accordance with claim 13 wherein said fluorescent dye is present in an amount of from about 10⁻³ to about 10 mole percent based on the moles of said hydrocarbon host material.
 18. An organic electroluminescent device comprising in the following sequence an anode, an optional buffer layer, a hole transporting layer, a light emitting layer comprised of a hydrocarbon compound of Formulas (I), (II) or mixtures thereof, an electron transport layer, and a cathode.
 19. An electroluminescent device in accordance with claim 18 wherein said buffer layer is comprised of a phthalocyanine derivative, and wherein said hole transport layer is comprised of a tertiary aromatic amine.
 20. An electroluminescent device in accordance with claim 19 wherein said tertiary aromatic amine is N,N′-di-1-naphthyl-N,N′-diphenyl-benzidine.
 21. An electroluminescent device in accordance with claim 18 wherein said electron transport layer is comprised of tri(8-hydroxyquinolinato)aluminum.
 22. An electroluminescent device in accordance with claim 19 wherein said electron transport layer is comprised of triazines, or a triazine.
 23. An electroluminescent device in accordance with claim 22 wherein said triazine is selected from the group consisting of 4,4′-bis-[2-(4,6-diphenyl-1,3,5-triazinyl)]-1,1′-biphenyl, 4,4′-bis-[2-(4,6-di-p-tolyl-1,3,5-triazinyl)]-1,1′-biphenyl, 4,4′-bis-[2-(4,6-di-m-tolyl-1,3,5-triazinyl)]-1,1′-biphenyl, 4,4′-bis-[2-(4,6-di-p-methoxyphenyl- 1,3, 5-triazinyl)]-1,1′-biphenyl, and 2,4,6-tri(1,1′-biphenyl-4-yl)-1,3,5-triazine.
 24. An electroluminescent device in accordance with claim 18 wherein said light emitting layer further includes a fluorescent dye.
 25. An electroluminescent device in accordance with claim 24 wherein said fluorescent dye is selected from the group consisting of 9-acridones, quinacridones, and perylenes.
 26. An electroluminescent device in accordance with claim 18 wherein said light emitting layer is comprised of a mixture of hydrocarbon compounds of Formulas (I), (II), or mixtures thereof, and wherein the second hydrocarbon (II) is present in an amount of from about 1 to about 50 mole percent based on the mole percent of the first hydrocarbon compound, and wherein the total of (I) and (II) is about 100 percent.
 27. An electroluminescent device in accordance with claim 18 wherein said anode is comprised of indium tin oxide in a thickness of from about 1 to about 500 nanometers; said buffer layer is comprised of a phthalocyanine in a thickness of from about 5 to about 80 nanometers, said hole transport layer is comprised of a tertiary aromatic amine in a thickness of from about 5 to about 300 nanometers; said light emitting hydrocarbon layer is of a thickness of about 5 to about 300 nanometers, and said cathode is comprised of a magnesium silver alloy or a lithium aluminum alloy in a thickness of from about 10 to about 800 nanometers.
 28. An electroluminescent device in accordance with claim 1 wherein said element is a layer, said first electrode is an anode, and said second electrode is a cathode.
 29. An electroluminescent device in accordance with claim 1 wherein said element is comprised of a layered electroluminescent arrangement comprised of a hole transport layer, and a light emitting layer wherein optionally hydrocarbon compounds are added thereto, and an electron transport layer; and which element is positioned in between said anode and cathode.
 30. An electroluminescent device in accordance with claim 1 wherein said element represents a single layer, a plurality of layers, or a plurality of laminated layers.
 31. An electroluminescent device in accordance with claim 1 wherein said electron transport layer is comprised of tri(8-hydroxyquinolinato)aluminum, or a triazine.
 32. An electroluminescent device in accordance with claim 1 wherein said light emitting layer further includes a fluorescent dye.
 33. An electroluminescent device in accordance with claim 1 and further including an electron transport layer wherein said hole transport layer is comprised of a tertiary aromatic amine.
 34. An electroluminescent device in accordance with claim 1 wherein said first electrode is an anode of indium tin oxide, said hole transport is a tertiary aromatic amine, said light emitting hydrocarbon is of a thickness of from about 5 to about 300 nanometers, and said second electrode is a cathode of a metal alloy.
 35. A compound of Formulas (I), (II), or mixtures thereof.
 36. A compound of the Formulas

wherein R¹ and R² are substituents, which are selected from the group consisting of hydrogen, an alkyl, an alicyclic alkyl, an alkoxy, a halogen, and a cyano; Ar¹ and Ar² are each independently an aromatic component or an aryl group comprised of a from about 4 to about 15 conjugate-bonded or fused benzene rings; or

wherein R¹ and R² are independently selected from the group consisting of hydrogen, an alkyl group, an alicyclic alkyl group, an aryl group, an alkoxy group, a halogen, a cyano group; R³, R⁴, R⁵, and R⁶ are independently selected from the group consisting of hydrogen, an alkyl group, an alicyclic alkyl group, an aryl group, and an alkoxy group; wherein R³ and R⁴, or R⁴ and R⁵ are optionally combined into a bivalent hydrocarbon group selected from the group consisting of an alkylene, an alkylidene, an alicyclic alkylidene, and an arylalkylidene; wherein Ar¹ and Ar² are independently an aryl group; and wherein Ar is a tetravalent aromatic group.
 37. An organic electroluminescent device in accordance with claim 1 wherein said first electrode is an anode and said second electrode is a cathode.
 38. An organic electroluminescent device in accordance with claim 18 wherein R¹ and R² are selected from the group consisting of hydrogen, aliphatic, halogen, and cyano; and Ar¹ and Ar² are each independently an aromatic component. 